Newton's argument in the Scholium to the Principia establishes that purely relational motion cannot distinguish absolute acceleration from rest, undermining relational collision predictions.

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Absolute acceleration(what Newton's argument is trying to establish): The idea that acceleration (speeding up, slowing down, or changing direction) is a real, objective fact about an object's motion, not just how it appears relative to other things.
Collision predictions(the practical consequence affected by the motion debate): Scientific forecasts about what will happen when two objects crash into each other based on their motion.
Distinguish(as used in the philosophical argument): To recognize or point out how two things are different from each other.
Newton: # Newton A Newton is a unit of measurement that describes force—basically, the push or pull needed to move something. It's named after Sir Isaac Newton, an English scientist from the 1600s who discovered the fundamental laws explaining how objects move and how gravity works. You encounter Newtons all the time: for example, the force you apply when pushing a door or the weight of an apple falling from a tree can be measured in Newtons.

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